Tool for tapering plugs



(No Model.)

J. F. BROWN. TOOL FOR TAPERING PLUGS.

No. 433,615. Patented Aug. 5, 1890.

an- I t I I N; 1 Ag I x1 H1116 INVENTU PK WITNESEEE UNITED STATES PATENTOFFICE.

J Ol-IN F. BROWN, OF BROOKLYN, NEW YORK.

TOOL FOR TAPERING PLUGS.

SPECIFICATION forming part of Letters Patent No. 433,615, dated August5, 1890.

7 Application filed May 13, 1890. Serial No. 351,708- (No model.)

To all whom it may concern:

Be it known that I, JOHN F. BROWN, of Brooklyn, New York, have inventedan Improved Finishing-Tool for Tapering Plugs, of which the following isa specification.

This invention relates to a tool by which the surface of cast taperingplugs may be quickly planed or finished.

It consists in the various features of improvement, more fully pointedout in the claims.

In the accompanying drawings, Figure 1 is a longitudinal central sectionof my improved tool; Fig. 2, a side View of sleeve (1-; Fig. 3, an endView thereof; Fig. 4, a side View of the centering-pin cl; Fig. 5, anend View thereof, and Fig. 6 a side view of a plug finished by the tool.

The letter a represents a tubular sleeve having a tapped end, by whichit is connected to a second sleeve a. This sleeve has a tapped socket M,by which it maybe mounted upon the spindle of a lathe. If desired, thesleeves a a may, however, be made in one piece. The sleeve a is partlycut away at one end, as at a for the introduction of a knife, cutter, orplaner b. This knife has a v tapering cutting-edge, Fig. 2, and issecured by screws 12', entering slots in the knife, to a projection a ofsleeve a. Set-screws b passing through a flange a of projection to andbearing upon the upper edge of the knife, permit its adjustment. Theset-screws b carry jam-nuts 5 as shown. Within the sleeve a there isplaced a tapering bushing c. This bushing may be removed when worn, andit is slotted, as at c, in line with the slot a of sleeve on for theintroduction of the knife Z1. Through the sleeve a there passes acentering-pin cl, having a head or enlargement d, that enters the boreof sleeve a. This head is provided with a serrated circular cuttingedged and with a central prong or drill 01 The pin (Z is adjustablelengthwise, and is locked in position by a screw e passing through atapped perforation of sleeve a. By pushing the pin more or less far intothe sleeve a the tool is set to finish plugs of different lengths. Inorder to permit the head cl to be pushed beyond the end of the knife Z),Fig. 1,

it is provided with a longitudinal groove d. In use the cast plug A tobe finished is fed by hand or otherwise into the open end of thetapering bushing c, Fig. 1.

The tool is revolved while the plug is not revolved, and thus the knifewill gradually finish the circumference of the plug. As the plug isbeing reduced, it is gradually fed deeper into the sleeve a, until itfinally strikes the head 61' of the centering-pin d. The central drill(Z of this pin will cut a small central socket finto the end of theplug. In this Way the plug is centered, while the socket f issubsequently tapped for the reception of the usual cock-screw. Thecircular cuttingedge (Z will at the same time out the usual offset orshoulder f into the end of the plug.

\Vith this tool tapering plugs can be quickly finished, and unskilledlabor may be employed.

\Vhat I claim is 1. The combination of a slotted sleeve with a taperingslotted bushing and an adjustable cutter projecting into the bushing,substantially as specified.

2. The combination of a slotted sleeve with a cutter entering the sameand with an adjustable centering-pin, substantially as speci- 3. Thecombination of a slotted sleeve with a cutter entering the same and witha centering-pin provided with the central drill d and the circularcutting-edge (1 substantially as specified.

l. The combination of a slotted sleeve with a tapering bushing, anadjustable cutter, and an adjustable centering-pin, substantially asspecified.

5. The combination of the following elements: a slotted sleeve, atapering bushing, an adjustable cutter, and an adjustable centering-pinhaving head cl, that is provided with drill (i circular cutting-edge (Jand longitudinal groove (Z substantially as specified.

JOHN F. BROWVN.

